Roasting and chlorine leaching of gold-bearing refractory concentrate: Experimental and process analysis
Roasting and chlorine leaching of gold-bearing refractory concentrate: Experimental and process analysis
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DOI：
10.1016/j.ijmst.2013.08.015
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发表时间：
2013-09-01
影响因子：
11.8
通讯作者：
Veglio, Francesco
中科院分区：
文献类型：
--
作者：
De Michelis, Ida;Olivieri, Agostino;Veglio, Francesco
本文研究了用氯浸法从难选精矿中提金。该工艺考虑通过在低氧浓度下进行低温氧化对耐火材料进行的前处理。氧化后的物质用盐水浸出处理。金在活性碳上吸附/还原后，铁和贱金属可用氢氧化钠沉淀。焙烧试验表明，必须进行至少550摄氏度的热预处理，以获得材料中硫和汞的减少(分别为50%和90%)。在650℃下进行的浸金试验中，金的浸出率最高(93%左右)，这一结果证实了优化热处理工艺以提高金的回收率和降低氯耗的必要性。与传统的氰化相比，氯化可能是一种有用的替代方法：事实上，金的萃取率相当低：未处理的原料中的提金率为57%，预处理原料中的提金率为25%。(C)爱思唯尔集团代表中国矿业大学出版的2013年。
This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process considers a pre-treatment of refractory materials by low temperature oxidation carried out with low oxygen concentration. The oxidized material is treated by leaching with brine. After gold adsorption/reduction onto activated carbon, iron and base metals can be precipitated by NaOH. Roasting tests show the necessity to carry out a thermal pre-treatment at least at 550 degrees C to obtain a reduction of sulfur and mercury in the material (50% and 90%, respectively). Highest gold extraction yield (around 93%) is obtained in the leaching test performed with material sample treated at 650 degrees C. This result confirms the necessity to optimize the thermal pre-treatment to improve Au recovery and to reduce chlorine consumption. A comparison with conventional cyanidation confirms that chlorination could be an useful alternative: in fact, gold extraction yield is quite low: 57% in non-pre-treated material and 25% in pre-treatment material. (C) 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.